unknown coredump !

[Nikolay Kalev]

I'm getting coredump of chkgrp.core and i don;t know the reason for 
this. Any ideas or suggestions ?
I'm attaching the coredump file ...
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Url : http://lists.freebsd.org/pipermail/freebsd-current/attachments/20050824/78aa6c6b/chkgrp-0001.obj